CVE-2026-50127CWE-918

Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)

Medium · published June 10, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
39.8
In the wild
Unconfirmed
What it is

Weblate is a web based localization tool. From version 5.15 to before version 2026.6, Weblate's VCS_RESTRICT_PRIVATE did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions. This issue has been patched in version 2026.6.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00471 · 39.8th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-06-10T19:56Z
EPSS history
Timeline
  • 10 JUN 19:56Z
    Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)
    cvelistv5